Insulator.



UNITED sTATEs PATENT oEEIoE.

JESSE E. MATEER, OF WILKINSBURG, PENNSYLVANIA, ASSIGNOR, BY MESNEASSIGN- MENTS, TO WESTINGHOUSE ELECTRIC & MANUFACTURING COMPANY, 0F EASTPITTSBURGH, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA.

INSULATOR.

To all whom t may concern:

Be it known that I, JESSE E. MATEER, a citizen of the United States, anda resident of Wilkinsburg, in the county of Allegheny and State ofPennsylvania, have invented a new and useful Improvement in Insulators,of which the following is a specification.

My invention relates to insulators and insulating bushings forsupporting electric line conductors and for separating the conductingleads of electrical apparatus from the casing which incloses suchapparatus. y

The object of my invention is to provide an improved arrangement ofconducting leads and simple and eicient insulating bushings suitable foroutdoor service by which very high-voltage leads may be supported andelectrically separated from the casing of a transformer or otherelectrical device.

Although not restricted in its appllcation, my invention is speciallyadapted for use with a series transformer in which the highvoltageWinding comprises comparatively few turns or convolutions so that thedifference in potential between the two leads is relatively small whilethe voltage of both may be very high.

Figures l and 2 of the accompanying drawings are views, at right anglesto each other, of a transformer and its inclosing casing with myinvention applied thereto, said structure being shown in section in Fig.1 in order to disclose more completely the arrangement of parts. l

Referring to the drawings, the device here illustrated comprises atransformer 1 having a magnetizable core member 2 and primary andsecondary windings 3 and 4, an inclosing casing 5 in which thetransformer is disposed and an insulating bushing (i for thehigh-voltage leads of the transformer winding which extend through thecover of the casing. The cover 7 of the tank' or casing everhangs thecasing wallsand is provided with insulating bushings 8 for thelow-voltage leads of the transformer. The transformer is supportedentirely from the cover member 7 by means of rods 9 which projectdownwardly therefrom and to which the end plates l() of the transformer`core are adjustably clamped.

The insulating' structure comprises an Specication of Letters Patent.

Application filed August 8, 1908.

Patented Nov. 18, 1913.

serial No. 447,497.

outer sleeve or bushing 11 having a stepped outer surface, the middleportion of which -is gripped by a clamping ring or collar `12 of metalby which the structure is supported,

a. relatively long inner sleeve or bushing 13 l which is cemented to theouter sleeve and extends from each end thereof, its outer sur face beingcorrugated at the upper-end; a pair of conducting members 14 and 15which are disposed within the inner sleeve, asJhereinafter pointed out.,and a plurality of insulating skirts 16 and 17 which together Y form acontinuation of the inner insulating sleeve 13. The conductor 14 is inthe form of a cylindrical rod and is surrounded by a tube 18 of hardinsulating material which is preferably constructed as set forthv inPatent No. 858,385, granted July 2, 1907, to

the Westinghouse Electric & Manufacturing conductor 15 is in the'form ofa tube and is fitted over the .insulating tube '18 but-is somewhatshorter in order that a greater in sulatingsurface distance maybeobtained between the corresponding ends of the conductors. surroundedby a second insulating tube 19 which is securely cemented into the innersleeve 13 and projects for a material distance from its upper end.Theinsulating skirts 16 and 17 are provided with axial holes throughwhich the upper extremity of the insulating tube may extend and they aresimilar to each other except that the flange of the lower skirt 16 ismaterially longer and more widely extended in order to protect thejoints formed between the inner and outer insulating sleeves and thecollar by which they are supported. The adjacent surfaces of theinsulating skirts are provided with cooperating annular grooves 192t andprojections 20 and these parts are cemented together so that, in theassembled structure, a continuous bushing of hard inorganicweather-proof insulating material,

The tubular conductor 15 is also .Company as assignee of Emil Haefely.The

instead of being adapted for two leads as in.

the drawings which form parts of this application. Thevoltage-sustaining or resisting power of the bushing is materiallyimproved by the use of the metal cap or caps since, by this means, theelectrostatic leakage which iinpoverishes the insulating propei'tiesofthe surrounding air and produces the so-called corona effects with veryhigh voltage is materially reduced and is carried away from the adjacentporcelain parts, which have. shown a tendency to 'become overhcated andcracked if they are kept close to the static discharge points of theconducting terminal member.

Terminal members 24 and 25 are severally 2s secured to the metal caps 21and 22 so that these parts may be readily connected to external circuitconductors. The lower eX- tremities of the conductors are similarlyrovided with terminal members 29 to W ich 30 the. ends of thehigh-voltage transformer winding are connected by means of tiexibleconductors 26. The collar 12 is provided with a fiange 27 which issecured to the cover member of the transformer casing around the edge ofan opening 28 through which the lower end of the insulating structureextends. r

It will be observed that the structure is 'particularly well fitted forvery high-voltage 40 outdoor service since none of the exposed parts areliable to deteriorate in Contact with air ou moisture.

It will be understood that various structural variationsnuay be effectedin the device illustrated in the drawings without departing from thespirit of my invention and I desire that such variations shall be inelule hwithln its scope.

I claim as my invention:

1. An insulating structure comprising a tube, a series ot overhangingskirts fitted upon said tti-be and cemented thereto and an externalmeta'fl cap or crown, combined with a conductor that extends throughsaid tube and is connected tol said cap or crown .hav-

ing an overhaugipg skirt. v

2. An insulated lead structure for electrical apparatus comprisingconcentric conductors, an interposed insulating tube, and a segmentalsleeve or bushing ot inorganic weather-proof insulating materialcomposed of a seificsoi overhanging skirts, and metal Caps oi"l crownselectrically separated from each other and severally connected to theconcentric conductors.

r 3. In electrical apparatus, the combina.- tion with aninclosing casinghaving a cover and tiexible conducting leads within the casing, ofconcentric conductors, an interposed insulating tube, an insulatingbushing com-v.` posed of aninsulating sleeve secured to the Y covermember and a series of overhanging insulating skirts mounted on saidsleeve above the cover, and caps or crowns of conducting material thatoverhang the insulat-` ing skirts and are severally connected to theconcentric conductors.

4. In electrical apparatus, the combination with an inclosing casinghaving a cover and conductinff leads supported thereby, of vaninsulating bushing structure comprising concentric insulating sleevesextending through the cover and secured thereto, insulating tubes withinthe sleeves, a plurality -of insulating skirts mounted upon the tubesand forming a continuation of the sleeves land a metal capl overhangingthe skirts and connected to one of the leads.

.5. In electrical apparatus, the combination with an inclosing casinghaving-a cover, of. a. pair of concentric conductors extending outwardlythrough the cover, an insulating tube interposed between saidconductors, an insulating tube surrounding the outer conductor,relatively short insulating sleeves encircling and supporting the tubesand conductors and secured to the cover, and a plurality of insulatingskirts mounted upon the tubes to form a continuation of the sleevesand`overhang the joints between the adjacent parts.

6. A structure for electrical apparatus comprising concentric conductorsof ditlieront lengths, a separating insulating tube, an outer tubesurrounding and supporting the outer conductor, a relatively shoi'tinsulating sleeve surrounding the tube, a plurality of skirts forming acontinuation of the sleeve and overhanging the joints formed betweenadjacent parts, and metal caps or crowns severally secured to theconductors and overhanging the upper skirt.

7. An insulatingr structure comprising a weather-proof bushing or sleevehaving a series of overhangiug skirts of insulating material and anoverhanging metal cap at the top of said series, combined with aconductor that extends through said bushing or sleeve and is connectedto said metal cap.

In testimony whereof, I have hereunto subscribed my name this 31st dayof July,

loos. Y

JE SSE lil. MA'llllClt.

lVi tnesses l. S. Lawson, univer Ilisics.

